Most often encountered in an office setting where new introductions or hand shaking is prevalent.
The precursor involves a man who urinates without washing his hands. Shortly thereafter, when this man is in a situation which warrants shaking hands with someone else, the other individual will be on the receiving end of a penis handshake.
Man 1 "I was taking a company dumpthe other day and I was peeping at other dudes... And this guy comes in, drains his lizard, and then walks right back out."
Man 2 "I'd hate to be the guy on the other end of that penis handshake. Fucking gross"
Just like Second hand smoke, you may be in danger of second hand penis. The act of toching ones shaft, penis, or balls and then shaking hands or touching another person, thus transfering your touch unto them.
Matt goes to the bathroom and fires one off. He then goes to class and shakes hands with Adam. Adam is now a victim of Second Hand Penis, and may now be considered 1/3 gay.
Top minion Kevin: is that penis with a thick layer of leather around it
Gru: nah Kev that’s just a minion tryna put his middle finger up at you, kinda looks like a Minion hand penis